<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

    欢迎你，<span th:text="${username}"></span>! 请点击以下链接，激活您的账号！
    <a th:href="${url}">激活链接</a>
</body>
</html>